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In
1970, the Cutlass Supreme was distinguished from the rest of the Cutlass
lineup by the distinctive notchback body style #57, which had been introduced
on the 1969 Pontiac
Grand Prix and also used on the 1970
Cheverolet Monte Carlo. The GM cars that used this body style were
alternately designated as the "A-special" or "G"-body,
to designate not only the unique body-style, but also the longer wheelbase
chassis used by the Grand Prix (118") and Monte Carlo (116").
The
Cutlass Supreme, however, used the "A-special" body shell on
the standard 112" wheelbase A-body chassis used by all other 1970
Cutlasses. The Cutlass Supreme model was designated the 4200 line, and
came as either a 2-door hardtop "Holiday Coupe" (style #4257)
or Convertible (style #4267). The SX was not available on the Cutlass
Supreme 4-door Holiday Sedan.
The
two distinguishing features of the exterior of the SX option are the "SX"
badges located below and to the right of center of the "Cutlass"
script emblem on the front fenders, and the rear bumper with two cutout
notches to accept the trumpet-style chrome exhaust tips on the standard
dual-exhaust system. 
Although
the dual-exhaust option was available on non-SX Cutlass Supremes, the exhaust
tips on these systems turned down before the bumper, and thus did not use
the distinctive "cutout" rear bumper that the SX shared
with the 442 model of the same year.
The other distinctive trim that the SX shared with other Cutlass Supremes
is the polished ribbed stainless-steel side-trim that ran the length of
the car and encircled the side-marker lights, and the chrome wheel-well
molding that only went down as far as that side trim strip, unlike the
moldings on non-Supremes, which went all the way down to the rocker panels.
The vinyl top option for 1970 and 1971 was surrounded by a chrome trim "halo" molding, which was a combination of stainless-steel strips and chromed pot-metal corners. These corners are prone to breakage, are not easily repaired, and are not available in reproduction form. The best options for replacing these trim pieces is finding a rare (and expensive) NOS trim piece, or finding a good used replacement. In 1972, the Cutlass Supreme used a vinyl top that went all the way to the windshield trim strip and the side gutters, eliminating much of the stainless trim.
